DVK Calorimetric Flowmeter/Monitor/Totaliser

Brand: KOBOLD Instruments, Inc.

The digital KOBOLD flow meter/monitor Model DVK serves to measure and monitor small and average flows of air in piping and hoses. The device is absolutely maintenance-free and uses the calorimetric method.

When the operating voltage is applied, a thermistor integrated in the sensor is heated to a defined value above the medium temperature. When air (or gas) flows through the sensor, the heat generated in the sensor is absorbed by the medium.

This means that the sensor is cooled down to the medium temperature. Depending on the velocity and rate of flow, the temperatures are equalized and the resistance of the sensor is reduced proportionally.

The flow velocity can be determined by measuring the resistance. The medium temperature is measured by a second sensor.

The resistance values of both sensors are compared by the electronics over a Wheatstone bridge circuit and an output relay is actuated if the set switching values has not been made or exceeded.

The switch state is signaled by two LEDs (ON: LED on; OUT 1*: green, OUT 2*: red). The digital KOBOLD flow meter type DVK works with practically no pressure loss.

Typically, the device is available in two different versions (display and sensor as compact instrument, or display and sensor separated but connected with a cable) with the necessary screw connections.

Specifications

Accuracy

  • ± 5 % of Full Scale

Applications

  • Flow Monitoring of Air & Gases
  • In Air Conditioning Systems
  • In Extraction Systems

BSP Connection

  • G 1"
  • G 1/2"
  • G 1/4"
  • G 1-1/2"
  • G 2"
  • G 3/8"

Connection Material

  • Aluminum Die Casting

Display

  • 3-Digit 7-Segment LCD Display

Electrical Connectors

  • M12 × 1 with 2 metres Cable

Enclosure, Body Material

  • FeNi
  • Lead Glass
  • OFC
  • PBT
  • PPS
  • PTLR

Environmental Protection

  • IP65

Flow Rate

  • 1 to 12,000 L/minute - to Air

Gasket Material

  • NBR

Hysteresis

  • Adjustable

Indication

  • 2 × LED - Switching Indication

Materials of Construction

  • 316 Stainless Steel - Sieve Material

Mounting Position

  • Any Orientation

Operating Pressure

  • psi: -7.252 to 217.6 (kPa: -50 to 1,500, bar: -0.5 to 15)

Operating Temperature

  • 0° to 50° C (32° to 122° F)

Output

  • 4-20 mA
  • 80 mA
  • Load - Maximum

Power Requirement

  • Maximum

Repeatability

  • ± 1 % of Full Scale for DVK- to 01 / DVK- to 05
  • ± 2 % of Full Scale for Other Typicals

Response Time

  • 1 second

Sensor / Probe Material

  • FeNi
  • Lead Glass
  • OFC
  • PBT
  • PPS
  • PTLR

Supply Voltage

  • 12-24 Vdc

Switch Type

  • 2 × PNP, Open Collector

Temperature Range

  • 0° to 50° C (32° to 120° F)

Vibration

  • 10 to 500 Hz

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